Lubricant compositions stabilized with multiple antioxidants
AssigneeChemtura Corporation
InventorsJun Dong, Cyril A. Migdal
Life of this patent
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Abstract
A lubricant composition is disclosed that comprises lubricating oil and a mixture of at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine. Also disclosed is a method of increasing the oxidation stability of a lubricating oil comprising adding thereto at least two antioxidants, the first antioxidant being a secondary diarylamine and the second antioxidant being a substituted para-phenylenediamine.
Claims6
A lubricant composition comprising:
- (A) at least one lubricating oil selected from the group consisting of natural and synthetic lubricating base oils;
- (B) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a mixture of mono-, di-, and tri-nonylated diphenyl amines;
- and
- (C) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a blend of N-(hexyl/heptyl)-N′-phenyl-para-phenylenediamine.
A fuel composition comprising:
- (A) at least one motor fuel;
- (B) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a mixture of mono-, di-, and tri-nonylated diphenyl amines;
- and
- (C) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a blend of N-(hexyl/heptyl)-N′-phenyl-para-phenylenediamine.
A method of increasing the oxidation stability of a lubricant comprising adding to said lubricant
- (A) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a mixture of mono-, di- and tri-nonylated diphenyl amines;
- and
- (B) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a blend of N-(hexyl/heptyl)-N′-phenyl-para-phenylenediamine.
A method of increasing the oxidation stability of a motor fuel comprising adding to said motor fuel:
- (A) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a mixture of mono-, di-, and tri-nonylated diphenyl amines;
- and
- (B) from 0.5 weight percent to 1.0 weight percent, based on the total weight of the composition, of a blend of N-(hexyl/heptyl)-N′-phenyl-para-phenylenediamine.
Dependencies are inferred from the claim text.